Apparatus for supporting a firearm



FIG. 1 is a perspective view of an apparatus for supporting a firearm showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a side view thereof;

FIG. 5 is a left side view thereof; and,

FIG. 6 is a right side view thereof. 

I claim the ornamental design for an apparatus for supporting a firearm, as shown and described. 